What are the best tools for scraping?

function scanpage($url){
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_HEADER, true);
    $output = curl_exec($ch);
    curl_close($ch);
    return $output;
}

$mypage = scanpage('http://domain.com');

<tr class="header"><td class="firstrow">Juicy information here</td><td class="secondrow">

$newpage = str_replace('header"><td class="firstrow">','^',$mypage); // replace before text with a token
$newpage = str_replace('</td><td class="secondrow','^',$newpage); // stick another token after the data we want so we can segregate it
$newpageE = explode("^",$newpage); // turn page into array of 3 values, all the before stuff (we don't want), all the middle stuff (we do want) and all the after stuff (we don't want)
$mydata = $newpageE[1]; // the variable is now only the middle info, everything between the first and second token (^).  Exactly what we wanted to extract
// specifically, the [1] stands for the 2nd value of the array (the middle).  [0] would have returned the first data before the first ^, and [2] would return all data after last ^.

$html_to_scrape = <div id="example">(.*?)<\/div>; 

//remember to escape the forward slashes

//the (.*?) is a wildcard that means 'scrape everything that was here'

preg_match($html_to_scrape, $output, $result);

echo $result;